MeterStatus App for iPhones and iPads.
Supports WishKit!
More details here https://www.wishkit.io
Theme
Automatic darkmode theme. You can always change it in the settings.
Widgets
Widgets for the lock screen and home screen on the iPhone and iPad.
Lifetime purchase
19.99$ Lifetime access to the pro version.
Subscription
0.99$ monthly or 9.99$ yearly to get access to the pro version.